Calipers



Jan. 1, 1929.

A. H. EGGERS CALIPERS Original Filed Dec. 1, 1926 YIIIIIIII/A 5 Patented Jan. 1, 1929.

U N. IT E D STAT ES P N T l ARVEL H. EGGE RS, OF HOQUIAM, WASHINGTON.

CALIPERS.

Application filed December 1, 1928, Serial No. [51,986, Renewed May 24, 1928.

This invention relates to tools and has special reference to a calipering tool.

One important object of the invention is to improve the general construction 01 devices of this character.

In using the ordinary type of calipers it is necessary to use both hands in setting the caliper-t open or closed positions and this causes great delay in shop operations such as in turning metal, stone, wood and the like as well as in the other operations wherein calipers are commonly used to. accurately obtain sizes.

A second important object of the invention is to provide an improved arrangement of caliper wherein the tool can be set to the required size with one hand thus doing away with the necessity of stopping the lathe'or other machine tool and enabling the operator to use his other hand for such purposes as may be necessary at the time.

With the ordinary type of calipers the size can only be obtained by applying the points of the calipers to a scale.

A third important object of the invention is to provide an improved construction of caliper wherein the calipers themselves will indicate accurately the size to which they are adjusted.

A fourth important object of the invention is to provide an improved form of calipers so arranged that they may be set to the desired size with one hand only, said: calipershaving means to secure them in the set or adjusted position.

With the above and other objects in view as will be hereinafter apparent, the invention consists in general of certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanyingdrawings and specifically claimed.

In the accompanying drawings like char actors of reference indicate like parts in the several views, and:

Figure 1 is a face view showing the improved calipers in full lines as applied to a pipe section, and in dotted lines as adjusted to a second position.

Figure 2 is an enlarged detail section on the line 22 of Figure 1.

Figure 3 is an enlarged detail section on the line 33 of Figure 1.

In the construction of these calipers two members are provided which are pivoted intermediate their ends as by a pivot and: it is: to be understood that this pivot may be of any prefcrredtorm or variety. One end portion of each of these members is shaped to constitute a caliper-leg 11. provided with the usual calipering point 12, these points 1210cing engageable with opposite points on an article to be calipered such as the pipe P. It will be seen that there is here shown a pair of outside calipers but it will be obvious that the same construction may equally well be applied to a pairof inside calipers, Each of the legs 11 carries a pin or post 13 and these posts are connected by a C-spring 14 which urges the points 12 toward each other. Obviously, with inside calipers the spring arrangement would besuch as to urge the points away from each other and the, peculiar type of spring here shown is to be taken as typical of any typ sprin means which I may desire to use. The other portion of one ofthese pivoted members is extended as at 1:5 and pro vided on its extremity with a handle 16. This member carries an arc bar 17 which may be formed integral with the member 15 or may be formed separately and suitably secured thereto. This are bar'is'arranged concentric to the pivot 10 and its inner edge is the same distance from the pivot as are the points 12. The are bar is graduated in any suitable graduations, here shown as inches and sixteenths, but the particular type of graduation may be varied as I may find desirable. For instance, it will be obvious that other divisions than sixteenths may be used or that the metric scale may beindicated'. The remaining member has its end terminating in a pointer 19 which traverses this are bar 17 and since the points 12 and the inner edge of the arc bar are equidistant from the pivot 10 the graduations 18 will be full size, that is to say, the distance between the points 12 "will be represented onv the arc bar by a full sized graduation corresponding to that distance. The member 15 carries a pivot 20 to which is pivoted the angle 01 an angle lever having an arm 21 extending up along the member 15 and terminating at its upper end in a thumb-piece 22 adjacent the handle 16 so that when the handle is grasped by the user his thumb will naturally rest on the thumbpiece 22. The remaining arm of this lever extends downward as indicated at 23 and terminates in an angularly arranged portion 24 having an upturned end 25 provided with a small lip 26. This angular end ll with its lip engage the leg 11 of the pointer provided member so that when the thumb-piece 22 is pressed toward the handle 16 the pointer 19 will move outwardly along the arc bar 17. Secured beneath the pointer is a clip member 27 which lies on the back or rear side of the arc bar 17 and carries at its free end a knurled set screw 28 by means of which the pointer may be clamped in position on the graduated arc bar.

In using the invention it will be seen that the handle 16 may be held in the users hand with his thumb resting on the thumb-piece 22. By pressing on the thumb-piece the points 12 are opened in the case of outside calipers or closed in the case of inside calipers and then placed over the article to be calipered. Upon relaxing pressure on the thumb-pie e 2 the pointer 19 moves inwardly or" the arc bar 17 until the points 12 engage the piece to be calipered whereupon the user may note the scale division oi the pointer and thus determine without the use of any other scale or implement the size of the piece bein calipered. As an example of the value or this use let us suppose that a machinist is turning a piece in a lathe. As the piece is turned down it will approach the required diameter and the machinist may from time to time with one hand caliper the piece being turned until he arrives at a point which he deems sufficiently close to require a line cross feed of the tool. 1 may then set these calipers by moving the thumbpiece 22 toward the handle 16 with one hand and clamping the pointer in position by the set screw 28. Then he watches carefully as the tool is fed into the work, the calipers being used in the usual manner of clamp calipers at this time.

There has thus been provided a simple and efficient device of the kind described and for the purpose specified.

It is obvious that minor changes may be made in the form and construction of the invention without departing from the material spirit thereof. It is not, therefore, desired to confine the invention to the exact form herein shown and described, but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is:

1. A calipering tool including a pair of members pivoted together intermediate their ends, the members having the portions on one side of the pivot formed to provide coacting caliper legs and the portions on the opposite side of the pivot forming extensions of said legs, said legs terminating in points engageable with opposite points on an article to be calipered, spring means urging said legs into article engaging position, a graduated arc bar extending laterally from one of the extensions concentric tothe pivot, a pointer on the other extension traversing the arc bar, a handle on the first named extension, and a lever pivoted intermediate its ends to the handle carrying extension and having one end adjacent the handle and adapted for engagement by the thumb of the user, the other end out said lever being engaged with the pointerpro *ided member to move the members against the action of said spring means.

A calipering tool including a pair of members pivoted together intermediate their ends, the members having the portions on one side of the p'vot formed to provide coacting caliper legs and the portions on the opposite side of the pivot forming extensions of said legs, said legs terminating in points engageable with opposite points on an article to be calipered, spring means urging said legs into article engaging position, a graduated. arc bar attending laterally from one of the extensions concentric to the pivot, a pointer on the other extension traversing the arc bar, a handle on the first named extension, a lever pivoted intermediate its ends to the handle carrying extensions and having one end adjacent the handle and adapted for engagement by the thumb of the user, the other end of said lever being engaged with the pointer provided member to move the members against the action of said spring means, a clip carried by the pointer extension and engaging beneath the arc bar, and a set screw screwed through .the clip and adapted to press against the arc bar to secure the pointer in adjusted position on said bar.

In testimony whereof I afiix my signature.

ARVEL H. EGGERS'. 

